TOYOTA 90179-10015 Nut with Washer

This genuine Toyota nut with washer (part number: 90179-10015) is a premium quality, factory fastener specifically engineered for the secure and durable fastening of critical vehicle components. The design with an integrated washer (flange nut) ensures optimal distribution of clamping force, minimizing the risk of surface damage to fastened parts and preventing loosening caused by vibration.

Technical Features and Specifications:

• Type: Hexagonal nut with washer (flange nut)
• Thread Size: M10 (typically with an M10x1.25 thread pitch)
• Material: High-strength, hardened steel
• Surface Treatment: Anti-corrosion coating against environmental impacts and rust
• Manufacturer: Toyota OEM (Original Equipment Manufacturer)

Function and Importance of the Washer Nut:

Flange nuts or nuts with integrated washers are critical in vehicle chassis, suspension, engine, and body assemblies. The integrated collar eliminates the need for a separate washer, reducing the component count and speeding up assembly while providing a larger bearing surface. This design prevents the deformation of fastened surfaces when tightening torque is applied.

Signs of Failure or Wear:

• Thread Damage: Tightening with improper torque (over-tightening) can cause threads to stretch or strip.
• Corrosion: In areas exposed to moisture and road salt, surface rust can weaken the material structure and make removal difficult.
• Deformation: Shape distortion caused by mechanical damage or previous improper installation, which reduces fastening effectiveness.

To ensure safe operation, damaged, corroded, or stretched nuts should always be replaced with a new, genuine factory-quality fastener.